When the Black Templars arrived at the Arviat Orbital Stations, their enthusiasm in the meticulous extermination of the Coven of Agony’s Kiss was exemplary of their rich history of brutality against xenoforms. The various and imaginative mortifications wrought upon the Arviat people at the hands of the Webway Eldar revealed themselves as the Black Templars gained ground. The blasphemous manner in which the humans had been ruined infuriated the Astartes. Their zealotry in exacting justice evolved into a crimson rage.
Check out to the associated Podcast episodes here (On Your Tabletop campaign) and here (Black Deeds audio short story).
Check out the Masters of the Forge Rules Supplements & Materials page for additional, homebrew narrative rules you can use in your campaign or event!